Foundation pit earthwork backfill compactness and elevation measuring device

Abstract

The utility model discloses a foundation pit earthwork backfill compactness and elevation measuring device, which belongs to the technical field of engineering measuring devices and comprises a support arranged at the bottom of a foundation pit, the support is provided with a first limit hole, a stress rod is slidably connected in the first limit hole, and the bottom of the stress rod is detachably connected with a compactness detector; a lifting rod assembly is arranged at the top of the stress rod, a stepping motor is detachably connected to the support, and the stepping motor is in transmission connection with the lifting rod assembly through a transmission assembly. The top of the lifting rod assembly is fixedly connected with an extension rod, the extension rod is sleeved with an impact sleeve rod in a sliding mode, the bottom of the impact sleeve rod and the extension rod are fixedly connected with impact rings respectively, the two impact rings make contact in the natural state, the top of the impact sleeve rod is fixedly connected with a photosensitive sensor, and a laser transmitter is arranged at an opening of the foundation pit. The device can be used for backfill elevation and backfill compactness measurement, is high in integration level, is slightly influenced by human factors in the measurement process, and improves the measurement accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering measurement devices, in particular to a foundation pit earth backfill density and elevation measurement device. Background Art

[0002] Backfill soil is the soil that is returned and compacted after the foundation and other below-ground projects are completed during the construction process. There are strict requirements for backfill density and backfill height for the backfill soil to prevent uneven settlement from causing damage to the building. In the existing construction process, backfill elevation measurement and density detection rely on different equipment, and the measurement of backfill elevation mostly relies on manual measurement by engineering personnel. Not only is the process cumbersome, but the measurement accuracy is also greatly affected by human factors; traditional density detection operations use manual downward pressure to obtain soil columns, and the detection accuracy is inaccurate.

[0003] Therefore, a device for measuring the compactness and elevation of foundation pit backfill is proposed. Utility Model Content

[0004] The utility model aims to provide a foundation pit earth backfill density and elevation measuring device, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following solutions: The utility model provides a foundation pit earth backfill density and elevation measurement device, comprising a bracket placed at the bottom of the foundation pit, a first limiting hole is opened on the bracket, a force-bearing rod is slidably connected in the first limiting hole, and a density detector is detachably connected to the bottom of the force-bearing rod;

[0006] A lifting rod assembly is arranged on the top of the force-bearing rod, a stepper motor is detachably connected to the bracket, and the stepper motor is transmission-connected to the lifting rod assembly through a transmission assembly; an extension rod is fixedly connected to the top of the lifting rod assembly, an impact sleeve rod is provided on the outer sliding sleeve of the extension rod, and impact rings are respectively fixedly connected to the bottom of the impact sleeve rod and the outside of the extension rod, and the two impact rings are in contact with each other in a natural state, a photosensor is fixedly connected to the top of the impact sleeve rod, and a laser emitter is arranged at the opening of the foundation pit.

[0007] Preferably, the lifting rod assembly includes a transmission shaft rotatably connected to the top of the force-bearing rod, a threaded groove is provided on the top of the transmission shaft, a threaded rod is threadedly connected to the threaded groove, the threaded rod extends out of the threaded groove and is fixedly connected to the extension rod, a limiting rod is fixedly connected to one side of the threaded rod, a sliding hole is provided on the bracket, the limiting rod is slidably connected to the sliding hole, and the stepping motor is transmission-connected to the transmission shaft through the transmission assembly.

[0008] Preferably, the transmission assembly includes a first bevel gear fixedly connected to the output shaft of the stepper motor, a second bevel gear is fixedly sleeved outside the transmission shaft, the first bevel gear is meshed with the second bevel gear, and the first bevel gear is located below the second bevel gear.

[0009] Preferably, the outer fixing sleeve of the force-bearing rod is provided with a limiting ring, and when the first bevel gear is meshed with the second bevel gear, the top of the limiting ring contacts the bottom of the bracket.

[0010] Preferably, the bottom of the bracket is also fixedly connected to a base, the bottom of the base is fixedly connected to a plurality of fixed cones, a second limiting hole coaxial with the first limiting hole is opened on the base, and the probe on the density detector is slidably connected to the second limiting hole.

[0011] Preferably, a plurality of limit blocks are fixedly connected to the outer wall of the extension rod, a plurality of limit grooves are opened on the inner wall of the impact sleeve rod, and the plurality of limit blocks are arranged in one-to-one correspondence with the plurality of limit grooves and are slidably connected.

[0012] Preferably, a force-applying handle is fixedly connected to the top of the impact sleeve rod, and the photosensitive sensor is fixedly connected to the top of the force-applying handle.

[0013] Preferably, buffer rubber pads are fixedly connected to opposite sides of the two impact rings respectively.

[0014] The utility model discloses the following technical effects: placing a bracket at the bottom of a foundation pit, installing a laser transmitter at the opening of the foundation pit, starting a stepper motor, driving a lifting rod assembly to rise through a transmission assembly, thereby driving a photosensitive sensor to rise; when the photosensitive sensor receives a signal from the laser transmitter, the stepper motor stops, and the height of the photosensitive sensor is calculated by recording the number of steps of the stepper motor; the height of the photosensitive sensor plus the height of the device itself is the height of the backfill elevation of the foundation pit;

[0015] When measuring the backfill density, the bracket is placed on the backfill soil, the stepper motor is removed, and the density detector is installed at the bottom of the force-bearing rod. The impact sleeve rod is pulled up to a certain position and then released. The upper impact ring falls freely and hits the lower impact ring, thereby applying a certain pressure to the extension rod. The extension rod transmits this pressure to the density detector, thereby driving the probe of the density detector to be inserted into the soil. By using the penetration test principle, the depth of the probe inserted into the soil is limited, and the number of times the impact sleeve rod needs to be pulled up is determined, thereby measuring the backfill density. This application can measure the backfill elevation and backfill density. The device is highly integrated, and during the measurement process, it is less affected by human factors, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the first limiting hole in the utility model;

[0019] Figure 3 It is a structural schematic diagram of the second limiting hole in the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of the extension rod and the impact sleeve rod in the utility model;

[0021] Figure 5 It is a schematic diagram of the structure of the impact sleeve rod and the buffer rubber pad in the utility model;

[0022] Figure 6 It is a structural schematic diagram of the transmission shaft and the threaded rod in the utility model.

[0023] In the figure: 1. bracket; 2. first limiting hole; 3. force rod; 4. density detector; 5. stepping motor; 6. extension rod; 7. impact sleeve rod; 8. impact ring; 9. photosensitive sensor; 10. laser transmitter; 11. transmission shaft; 12. threaded rod; 13. limiting rod; 14. sliding hole; 15. first bevel gear; 16. second bevel gear; 17. limiting ring; 18. base; 19. fixed cone; 20. second limiting hole; 21. limiting block; 22. limiting groove; 23. force handle; 24. buffer rubber pad; 25. motor support. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Reference Figure 1-Figure 6, the present utility model provides a device for measuring the compaction degree and elevation of foundation pit soil backfill, including a bracket 1 placed at the bottom of the foundation pit. A first limiting hole 2 is provided on the bracket 1, and a force-bearing rod 3 is slidably connected in the first limiting hole 2. A compaction degree detector 4 is detachably connected to the bottom of the force-bearing rod 3; the force-bearing rod 3 is threadedly connected to the compaction degree detector 4;

[0027] A limiting sleeve is fixedly connected to the bracket 1, and the first limiting hole 2 is provided on the limiting sleeve;

[0028] A lifting rod assembly is arranged at the top of the force-bearing rod 3. A stepping motor 5 is detachably connected to the bracket 1, and the stepping motor 5 is in transmission connection with the lifting rod assembly through a transmission component; An extension rod 6 is fixedly connected to the top of the lifting rod assembly. An impact sleeve rod 7 is slidably sleeved outside the extension rod 6. Impact rings 8 are respectively fixedly connected to the bottom of the impact sleeve rod 7 and outside the extension rod 6. The two impact rings 8 are in contact in the natural state. A photosensitive sensor 9 is fixedly connected to the top of the impact sleeve rod 7, and a laser emitter 10 is arranged at the opening of the foundation pit;

[0029] In this embodiment, the bracket 1 is in a U shape with the opening facing downwards. A motor support 25 is fixedly connected below the stepping motor 5, and the motor support 25 is detachably connected to the bracket 1 through a plurality of bolts; The stepping motor 5 is electrically connected to a controller, which can record the number of rotation steps of the stepping motor 5, and thus facilitate converting the number of rotation steps into height (specifically, it is prior art and will not be elaborated here).

[0030] In a further optimized scheme, the lifting rod assembly includes a transmission shaft 11 rotatably connected to the top of the force-bearing rod 3. A threaded groove is provided at the top of the transmission shaft 11, and a threaded rod 12 is threadedly connected in the threaded groove. The threaded rod 12 extends out of the threaded groove and is fixedly connected to the extension rod 6. A limiting rod 13 is fixedly connected to one side of the threaded rod 12. A sliding hole 14 is provided on the bracket 1, and the limiting rod 13 is slidably connected to the sliding hole 14. The stepping motor 5 is in transmission connection with the transmission shaft 11 through a transmission component.

[0031] In a further optimized scheme, the transmission component includes a first bevel gear 15 fixedly connected to the output shaft of the stepping motor 5. A second bevel gear 16 is fixedly sleeved outside the transmission shaft 11. The first bevel gear 15 meshes with the second bevel gear 16, and the first bevel gear 15 is located below the second bevel gear 16.

[0032] In a further optimized scheme, a limiting ring 17 is fixedly sleeved outside the force-bearing rod 3. When the first bevel gear 15 meshes with the second bevel gear 16, the top of the limiting ring 17 is in contact with the bottom of the bracket 1; thereby limiting the force-bearing rod 3 to prevent the force-bearing rod 3 from sliding upwards.

[0033] In a further optimized scheme, a base 18 is also fixedly connected to the bottom of the bracket 1. A plurality of fixing cones 19 are fixedly connected to the bottom of the base 18. A second limiting hole 20 coaxial with the first limiting hole 2 is provided on the base 18, and the probe on the compaction degree detector 4 is slidably connected to the second limiting hole 20.

[0034] According to a further optimized solution, a plurality of limit blocks 21 are fixedly connected to the outer wall of the extension rod 6, a plurality of limit grooves 22 are opened on the inner wall of the impact sleeve rod 7, and the plurality of limit blocks 21 and the plurality of limit grooves 22 are arranged one by one in correspondence and slidably connected.

[0035] According to a further optimized solution, a force-applying handle 23 is fixedly connected to the top of the impact sleeve rod 7 , and a light-sensitive sensor 9 is fixedly connected to the top of the force-applying handle 23 .

[0036] According to a further optimized solution, a buffer rubber pad 24 is fixedly connected to the opposite sides of the two impact rings 8 respectively; the two buffer rubber pads 24 are staggered to facilitate buffering.

[0037] When measuring the backfill elevation, first fix the laser transmitter 10 at the opening of the foundation pit, level the bottom of the foundation pit, set the position of the base 18 to ensure that when the photosensitive sensor 9 is flush with the foundation pit opening, the laser transmitter 10 can irradiate the photosensitive sensor 9, and then press the fixed cone 19 at the bottom of the base 18 into the soil. The height from the bottom of the base 18 to the photosensitive sensor 9 is the original height of the device, and this height is fixed. The controller controls the stepper motor 5 to start, driving the transmission shaft 11 on the second bevel gear 16 to rotate, thereby driving the threaded rod 12 to rise, thereby driving the photosensitive sensor 9 to rise. When the photosensitive sensor 9 receives the signal from the laser transmitter 10, the stepper motor 5 is stopped, the number of steps is recorded and converted into the rising height of the threaded rod 12, and the rising height plus the original height of the device can get the backfill elevation.

[0038] When measuring the density of backfill soil, first level the surface of the foundation pit backfill, press the fixed cone 19 at the bottom of the base 18 into the backfill soil, connect the upper end of the density detector 4 to the force rod 3, and insert the probe of the density detector 4 from the second limit hole 20 and connect it to the density detector 4, remove the stepper motor 5, pull the force handle 23, drive the impact sleeve 7 to stretch to the limit position, then release the force handle 23, the impact sleeve 7 falls freely, and the upper impact ring 8 hits the lower impact ring 8, thereby applying a downward pressure to the extension rod 6, thereby driving the probe on the density detector 4 to insert into the soil to a certain depth, and so on. Using the principle of penetration test, stop after inserting the specified depth, and perform backfill soil density detection according to the number of times the impact sleeve 7 is stretched.

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for measuring the compactness and elevation of foundation pit earth backfill, characterized in that: It comprises a support (1) placed at the bottom of a foundation pit, the support (1) is provided with a first limiting hole (2), a force bearing rod (3) is slidably connected in the first limiting hole (2), and a density detector (4) is detachably connected to the bottom of the force bearing rod (3); A lifting rod assembly is arranged on the top of the force-bearing rod (3); a stepper motor (5) is detachably connected to the bracket (1); the stepper motor (5) is transmission-connected to the lifting rod assembly via a transmission assembly; an extension rod (6) is fixedly connected to the top of the lifting rod assembly; an impact sleeve rod (7) is slidingly sleeved outside the extension rod (6); impact rings (8) are respectively fixedly connected to the bottom of the impact sleeve rod (7) and the outside of the extension rod (6); the two impact rings (8) are in contact in a natural state; a photosensitive sensor (9) is fixedly connected to the top of the impact sleeve rod (7); and a laser emitter (10) is arranged at the opening of the foundation pit.

2. The device for measuring the compactness and elevation of foundation pit earth backfill according to claim 1, characterized in that: The lifting rod assembly comprises a transmission shaft (11) rotatably connected to the top of the force-bearing rod (3); a thread groove is provided at the top of the transmission shaft (11); a threaded rod (12) is threadedly connected in the thread groove; the threaded rod (12) extends out of the thread groove and is fixedly connected to the extension rod (6); a limiting rod (13) is fixedly connected to one side of the threaded rod (12); a sliding hole (14) is provided on the bracket (1); the limiting rod (13) is slidably connected to the sliding hole (14); and the stepping motor (5) is transmission-connected to the transmission shaft (11) through the transmission assembly.

3. The device for measuring the compactness and elevation of foundation pit earth backfill according to claim 2, characterized in that: The transmission assembly comprises a first bevel gear (15) fixedly connected to the output shaft of the stepper motor (5); a second bevel gear (16) is fixedly sleeved outside the transmission shaft (11); the first bevel gear (15) is meshed with the second bevel gear (16); and the first bevel gear (15) is located below the second bevel gear (16).

4. The device for measuring the compactness and elevation of foundation pit earth backfill according to claim 3, characterized in that: The outer fixing sleeve of the force bearing rod (3) is provided with a limiting ring (17); when the first bevel gear (15) is meshed with the second bevel gear (16), the top of the limiting ring (17) contacts the bottom of the bracket (1).

5. The device for measuring the compactness and elevation of foundation pit earth backfill according to claim 1, characterized in that: The bottom of the bracket (1) is also fixedly connected to a base (18), the bottom of the base (18) is fixedly connected to a plurality of fixed cones (19), the base (18) is provided with a second limiting hole (20) coaxial with the first limiting hole (2), and the probe on the density detector (4) is slidably connected to the second limiting hole (20).

6. The device for measuring the compactness and elevation of foundation pit earth backfill according to claim 1, characterized in that: The outer wall of the extension rod (6) is fixedly connected with a plurality of limit blocks (21), the inner wall of the impact sleeve rod (7) is provided with a plurality of limit grooves (22), and the plurality of limit blocks (21) and the plurality of limit grooves (22) are arranged in one-to-one correspondence and are slidably connected.

7. The device for measuring the compactness and elevation of foundation pit earth backfill according to claim 1, characterized in that: A force-applying handle (23) is fixedly connected to the top of the impact sleeve rod (7), and the photosensitive sensor (9) is fixedly connected to the top of the force-applying handle (23).

8. The device for measuring the compactness and elevation of foundation pit earth backfill according to claim 1, characterized in that: Buffer rubber pads (24) are respectively fixedly connected to opposite sides of the two impact rings (8).

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